Question

Whats the integral of ln(x^2)

?

Answer 1

ln(x^2) = 2ln(x)

Answer 2

what is the integral of ln(x)?

Answer 3

1/x ?

Answer 4

no that's the derivative

Answer 5

wait

Answer 6

hint: let u = ln(x) and let dv = 1 dx

Answer 7

try not to just give answers? we can go to wolfram for that

Answer 8

@zzr0ck3r still not the final answer; but I'll take it off

Answer 9

xln(x) ? I still refuse to go by the answer :D

Answer 10

@Christos xlnx is not the answer. Use integration by parts

Answer 11

xln(x)-1

Answer 12

if you are just guessing you can go to wolframalpha and get the answer

Answer 13

I am not guessing I though x has a power of 1 so -1 at the end and outside of ln whatever is inside

Answer 14

I saw it somewhere long time ago but im not sure if its correct

Answer 15

u need to do integration by parts

Answer 16

is that what you are doing in class?

Answer 17

What is this, can you give me an example?

Answer 18

I am learning alone.

Answer 19

do you know what the product rule is with derivatives?

Answer 20

I do

Answer 21

it is like the inverse of that, it is how we undo that rule.

Answer 22

I would google it and read on it, it takes practice

Answer 23

the reverse?

Answer 24

sort of

Answer 25

do you know u substitution for integration?

Answer 26

yes

Answer 27

ok that "undoes" the chain rule, so now you need to learn by parts.
there are both crucial to learning integration
http://tutorial.math.lamar.edu/Classes/CalcII/IntegrationByParts.aspx

Answer 28

Look at this please: That's specifically what am trying to solve. http://screencast.com/t/0N48E4lhqM9

Answer 29

e^(2*lnx) = e^ln(x^2) = x^2
so you need the integral of x^2 not ln(x^2)

Answer 30

I solved it now :D I know how to find this thing very easy

(x^3)/3 without any actual formula

Answer 31

yeah:)

Answer 32

thanks

Answer 33

np